PD4ML is 100% Java application and according to Java concept there is no direct way for a Java application to crash hosting OS. On the other hand it may implicitly trigger some bugs of JVM, etc.

HTML rendering (the first phase of conversion procedure) is a resource consuming task. When it utilizes peak amounts, it may expose hidden OS/JVM installation/configuration problems. So I would analyze the following:
1. JVM tries to allocate an amount of memory, which exceeds the available. Please check if -XmxNNNm JVM command line parameter defines a value, which is not greater than physical amount of RAM
2. Hardware drivers incompatibility
3. Physical hardware defects

But as a first step I would recommend to upgrade JDK/JRE to the most recent version available for your platform